Method of preparing near-net shape silicon nitride articles and

Details Method of preparing near-net shape silicon nitride articles and Method of preparing near-net shape silicon nitride articles and

1990-09-13

1992-03-24

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264337, 264338, C04B 3558

Patent

active

050986317

ABSTRACT:
Use a material which has a coefficient of thermal expansion greater than silicon nitride and does not react with silicon nitride under hot pressing conditions either to fabricate or to coat hot-pressing die plates suitable for densification of silicon nitride. The die plates separate cleanly from the silicon nitride thereby allowing preparation of near-net shapes having complex geometries, but without post densification grinding or machining.

REFERENCES:
patent: 3830652 (1974-08-01), Gazza
patent: 3989438 (1976-11-01), Smith
patent: 4744943 (1988-05-01), Timm
patent: 4883776 (1989-11-01), Pyzik
patent: 4919689 (1990-04-01), Pyzik
Fulrath Hot Forming Processes, In Ceramic Bulletin, vol. 43, No. 12 (1964), pp. 880-885.

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